Work holding clamp



April 15, 1941. A STEACH 2,238,831l

WORK HOLDING CLAMP Filed March 18, 1959 INVENTOR ATTO R N EYS PatentedApr. 15, 1941 UNITED STATES PATENT OFFICE WORK HOLDING CLAMP AlexanderSteach, Dedham, Mass.

Application March 18, 1939, Serial No. 262,725

1 Claim.

'Ihis invention relates to a work holding clamp and has for an object toprovide a work holding clamp comprising an elongated frame of U-shape incross section having set screws to hold a pressure plate in positionagainst the work, and also having a thumb screw to restrict endwisemovement of the work in the frame and prevent loss of the pressure platefrom the frame.

A further object is to provide a device of this character which will beformed of a few simple and durable parts which will be inexpensive tomanufacture and which will not easily get out of order.

With the above and other objects in View the invention consists ofcertain novel details ol construction and combinations of partshereinafter fully described and claimed, it being understood thatvarious modifications may be resorted to within the scope of theappended claim without departing from the spirit or sacrificing any ofthe advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure 1 is a front elevation of the clamp showing a piece of materialheld securely in the frame.

Figure 2 is a longitudinal sectional view of the clamp taken on the line2-2 of Figure l.

Figure 3 is an end elevation of the clamp shown in Figure 1.

Referring now to the drawing in which like characters of referencedesignate similar parts in the various views, I designates a work benchand II designates a board or other work.

The clamp comprising the subject matter of this invention comprises anelongated frame I2 of U-shape in cross-section. The frame is providedwith openings I3 in the bottom to receive screws 8 to secure the frameto the Work bench III or the like. A thumb screw I4 is located at oneend of the frame I2 and passes freely through an opening I5` in thefront side of the frame. The thumb screw is threadedly engaged in anopening I6 in the rear side of the frame. Short set screws Il arethreadedly engaged in openings in the front side of the frame.

A combined pressure and protecting plate I8 is located within andextends longitudinally of the frame I2 and is provided with an openingI9 of larger diameter than the thumb screw through which the thumb screwIl passes loosely7 to permanently connect the pressure plate to theframe I2. The plate I8 serves to protect the work from being damaged bythe short set screws Il and also holds the work secured in the frame.

The thumb screw I4 forms a stop to limit end-` wise movement of the workin the frame.

In operation the plate I8 clamps the work to the rear side of the frameI 2 when the set screws Il are tightened. When one of the set screws istightened and the other set screw is loosened, a tapered or wedge-shapedpiece of work may be clamped by the plate to the rear side of the frame.The opening I9 being of larger diameter than the thumb screw permits theplate to pivot on the thumb screw when tapered work is to be clamped inthe frame.

From the above description it is thought that the invention will befully understood without further explanation.

What is claimed is:

A Work holding clamp comprising an elongated frame of U-shape in crosssection, a thumb screw disposed at one end of the frame passing freelythrough an opening in the front side of the frame and screw threadedlyengaged in an opening in the rear side of the frame, said thumb screwextending transversely across the U-shaped frame and forming a stop tolimit endwise sliding movement of a piece of work longitudinally betweenthe sides of the frame, set screws engaged through the front side of theframe, and a combined pressure and protecting plate against which theset screws exert pressure to clamp the work to the rear side of theframe, said plate being adapted to be adjusted by tightening one setscrew and loosening the other set screw to pivot the plate on the thumbscrew to hold tapered or wedge-shaped work, said plate being disposedwithin and extending longitudinally of the frame, said plate beingprovided with an opening of larger diameter than the thumb screw toreceive the thumb screw and permit the thumb screw to slidably andpivotally and permanently connect the plate to the frame.

ALEXANDER STEACH;

